Valve-grinder



C. DAHLSTEDT.

VALVE GRINDER. APPLICATION FILED DEC-23, 19m.

Patented Apr. 27, 1920.,

I [1106 07 M DEM/W UNITED STATES PATENT OFFICE.

CARL DAHLSTEDT, OF ROCKFORD, ILLINOIS.

VALVE-GRINDER.

To all whom it may concern:

Be it known that I, CARL DAi-ins'rno'r, a citizen of the United States,residing at Rockford, in the county of lVinnebago and State of Illinois,have invented certain new and useful Improvements in ValveGrinders, ofwhich the following is a specification.

This invention pertains to devices for grinding valves on their seatsfor the purpose of securing-a true and tight seating of the valves. Thispractice of regrinding the lift valves of motor vehicles is well known;but the matter of properly grinding the valves to remove carbon depositsand scoring or pitting so that the valves will seat tight and true, isdifficult to accomplish, especially by one inexperienced in the ham--dling of machine tools or metal Working.

The chief object of the present invention is to provide a simpleandinexpensive means permlttmg an inexperienced per-' son to properlygrind a valve, and to this end my invention consists, generally stated,in the provision of a suitable hand crank or handle adapted to connectwith a valve head for rotating the same, means for yieldingly andconstantly urging the valve against its seat, and of means forintermittently lifting the valve from and returning it to its seat whileit is being manually rotated by the hand crank.

I have also aimed to provide a valvegrinding device of the characterdescribed in which a valvewill be lifted from and returned to its seatat irregular intervals dur ing the grinding without interruption of thevalve turning operation, this being accomplished preferably by a simpledevice arranged on the valve push rod and actuated by one hand while theother is employed to turn the valve.

Other objects and attendant advantages will be appreciated as theinvention becomes better understood by reference to the followingdescription when considered in con- Specification of Letters Patent.

Patented Apr. 27, 1920.

Application filed December23, 1918 Serial No. 267,988.

the purpose of illustration, shown my im provements in connection withan internal combustion engine of the type in which the cylinder head 5is provided with a threaded opening 6 above and in alinement with thevalve. As shown in the drawing, the valve head 7 seats on a seat 8 andis provided with the usual stem or push rod 9 slidable vertically in asuitable bearing 11 and depending at its lower end within a rollerbearing 12 in which is guided the lower end of the push rod, not shown,which is actuated by the cam.

In order to properly grind a valve of this character a suitable mixtureof ground glass and oil, or other abrasive is sparingly applied to thebevel face of the valve, and the latter when in position on the valveseat is rotated back and forth about a quarter of a turn or more, thenlifted slightly from the seat and the position changed and then replacedand the operation repeated until the bearing surface is smooth andbright. It is this operation that I have aimed to perform without thenecessity of manually lifting the valve from its seat or fromappreciatively interrupting the rotation of the valve.

With the foregoing in mind, I have provided a manually rotatable memberin the form of a suitable crank '13 adapted for connection at its lowerend with the head of a valve, preferably by means of a blade 14 enteringa slot. 15 in the top of'the valve head. The crank 13 is supported inworking position by a block or cap 16 threadingly engaged in the opening6, the crank rod passing through a central opening in the cap. Anexpansion spring 17 interposed between an abutment 1.8 on the lower endof the crank rod and the underwall of the cap constantly urges thecrankrod downwardly when the supporting cap 16 is tightened in theposition shown in Fig. 1, and consequently urges the valve down againstits seat. It willibe manifest that with a construction of the characterdescribed the valve will be continually pressed against its seat whilebeing rotated by the crank 13 and that this downward pressure isautomatically imposed by the spring 17 and not by manual pressure.

Itis now desired to lift the valve and return it to its seat atirregular intervals in accordance with the above mentioned method whichis recognized as being most practical for obtaining the best results.For this purpose, I have provided a collar 19 adapted to be suitablysecured as by means of a set screw 21, to the lower portion of the pushrod 9 just above the bearing 12 and in cooperative relation with a disk22 which rests on the top of the bearing 12. This disk is free to rotatewith and independently of the push rod 9, and I have provided meansoperative between the collar 19 and disk 22 for causing these parts torotate together and for causing the push rod to be lifted atpredetermined intervals by holding the disk against rotation. This iseffected in a simple manner by equipping one of the parts, for examplethe collar 19, with one or more depending lugs 23 and providing theother part with a plurality of depressions 24 suitably arranged and inwhich the lugs 23 are adapted to enter. As shown in Fig. 1, when theselugs 23 are locate'din the depressions 24 the valve will be seated andthe collar 19 is arranged so as not to interfere with the abovementioned function of the spring. It will be manifest that when thecrank 13 is rotated all of the parts connected with the valve stem willturn in unison and that when it is desired to lift the valve from itsseat to change its position for the purpose mentioned above, theoperator who is turning the crank with one hand, uses the other tomomentarily hold the disk 22 stationary. This causes the lugs 23 to riseout of the depressions 24, thereby lifting the valve from its seatagainst the tension of the spring 17. According to the presentarrangement of the lugs 23 and depressions 24 the valve will be heldraised for approximately a half revolution or until the'lugs again enterthe re cesses, whereupon the disk 22 is released. As shown in Fig. 3,the depressions 24 might be quarteringly arranged, and it will beunderstood that by manipulating the disk 22 while the crank is beingturned the valve 7 may be raised and lowered at irregular intervals tosecure the desired interrupted movements and changed position of thevalve.

' lVhile I have illustrated and described single working embodiment ofmy improvement, it should be understood that various changes might bemade in the construction and arrangement without departing from thespirit and scope of the invention as expressed in the appended claims:in which I claim:

1. A valve grinder comprising a manually rotatable member adapted forconnection with a valve for imparting rotary movement thereto, means foryieldingly and constantly urging the valve against its seat, and meansadapted to be manually actuated independently of said rotatable memberfor causing the valve to be lifted at will from and returned to its seatwhile being rotated by said member;

of said yielding means when the second mentioned part is held againstrotation.

3. In an engine valve grinder of the character described, thecombination of means for rotat ng a valve, means for yieldingly urgingthe valve agalnst its seat, and means operative between the lowerportlon of the valve push rod and an ad acent stationary part of theengine for intermittently lifting the valve from its seat, at will andcausing, during the periods between said lifting movement, the valve tobe rotated against its seat. I 7

4. A valve grinder .of' the character described comprising a memberadapted to be threadingly engaged in connection with a cylinder head, arotatable member passing through said threaded member and adapted toconnect with a valve head for rotating the same, a spring operativebetween the rotatable and threaded members for urging the rotatablemember and the valve which it engages downwardly to press the valveagainst its seat, and means for causing the valve to be intermittentlylifted from and returned to its seat while the valve is being rotated.

5. A valvegrinder comprising in combination with a threaded opening inthe cylinder head above a valve, of a cap threadingly engaged in saidopening, a member co-axial with the valve and passing through said capand detachably engageable with the valve for rotating the same, saidmember movable rotatably and lengthwise of its axis with respect to saidcap, an expansion spring interposed between the cap and said member forurging the latter in a direction to force the valve against its seat,and means adapted to be actuated independently of operation of saidrotatable member forcausing the valve and said member to be liftedintermittently during rotation of the valve.

6. A valve grinder, comprising means operating on the head of the valvefor imparting rotary motion thereto, means for yieldingly urging thevalve against its seat, iv

and means cooperative between'the valve rod and a part of the engine forlifting the valve at will at variably different times during rotation ofthe valve. v

CARL DAHLSTEDT.

